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CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Amortization of upfront incentive consideration $ 10,878 $ 11,742 $ 22,050 $ 22,789
Stock-based compensation expense 7,330 4,885 16,124 8,484
Cost of revenue [Member]        
Stock-based compensation expense 2,902 1,972 6,435 3,358
Selling, general and administrative [Member]        
Stock-based compensation expense $ 4,428 $ 2,913 $ 9,689 $ 5,126